ExpectSaga放置声明失败，具有多个放置效果

Question

bounty到期在3天内。该问题的答案有资格获得+ 100声望赏金。Jonas Arcangel想要引起更多关注对此问题。

传奇有多个看跌期权。

export function* changeItemsSaga(action) {
    const prerequisite1 = yield select(prerequisite1Selector);

    // some processing

    yield put(actions.myAction1(payload1));

    // some more processing

    const prerequisite2 = yield select(prerequisite2Selector);

    // some more processing

    yield put(actions.myAction2(payload2));
}

当传奇返回多种效果时，我该如何写我的看跌预期？

it('should update items', () =>
    expectSaga(sagas.changeItemsSaga, action)
        .provide([
            [select(prerequisite1), {}],
            [select(prerequisite2), {}],
        ])
        .put([actions.myAction1(payload1), actions.myAction2(payload2)])
        .run());

ExpectSaga单元测试返回以下错误：

Saga test error:
put expectation unmet:

Expected
--------
{ channel: null,
  action:
   [ { type: 'MY_ACTION_1',
       payload: { myItem1: [Object] } },
     { type: 'MY_ACTION_2',
       payload: { itemCollection: [Object] } } ] }

Actual:
------
1. { channel: null,
  action:
   { type: 'MY_ACTION_1',
     payload:
      { myItem1:
         { index: 0,
           childItem1: [Object],
           childItem2: [Object] } } } }
2. { channel: null,
  action:
   { type: 'MY_ACTION_2',
     payload: { itemCollection: [ [Object] ] } } }

这个也不起作用。

it('should update items', () =>
    expectSaga(sagas.changeItemsSaga, action)
        .provide([
            [select(prerequisite1), {}],
            [select(prerequisite2), {}],
        ])
        .put(actions.myAction1(payload1))
        .put(actions.myAction2(payload2))
        .run());

它返回此错误。

Saga test error:
put expectation unmet:

Expected
--------
{ channel: null,
  action:
   { type: 'MY_ACTION_1',
     payload:
      { myItem1:
         { index: 0,
           childItem1: [Object],
           childItem2: [Object] } } } }

Actual:
------
1. { channel: null,
  action:
   { type: 'MY_ACTION_1',
     payload:
      { myItem1:
         { index: 0,
           childItem1: [Object],
           childItem2: [Object] } } } }
2. { channel: null,
  action:
   { type: 'MY_ACTION_2',
     payload: { itemCollection: [ [Object] ] } } }

Answer 1

provide语法使您可以测试传奇的最终效果，而不用引导所有状态。

这里是redux-saga docs-的示例]

test('test only final effect with .provide()', () => {
  /*
  * With the .provide() method from expectSaga
  * you can by pass in all expected values
  * and test only your saga's final effect.
  */
  return expectSaga(callApi, 'url')
    .provide([
      [select(selectFromState), selectedValue],
      [call(myApi, 'url', selectedValue), response]
    ])
    .put(success(response))
    .run();
});
通过调用actions调用2x，测试连续运行，并且put中间的sagas.changeItemsSaga有效地被跳过。

似乎您可能需要的功能是testSaga，它将使您更深入地了解效果的流程。